The element which exists in a liquid state for a wide range of temperature and
can be used for measuring high temperature is
(i) B
(ii) Al
(iii) Ga
(iv) In
The answer is the option (iii) Ga
Galium has different structural properties and can remain in the liquid state for a wide range of temperature since it is melting point is 30°C and boiling point is 224°C.